Three things drove the patterns of 1871 to 1873. The first was a new Chief Engraver. Chief Engraver James B. Longacre died on the first day of 1869. William Barber, who had worked as his assistant since 1865, was appointed to the post later that month. The 1871 silver patterns use a design credited to Longacre and cut into dies by Barber, while the new designs of 1872 are Barber's own.
The second was the long coinage bill. In 1870 John Jay Knox, the Treasury's deputy comptroller of the currency, drafted a revision of the Mint laws, and it passed through Congress over nearly three years before President Grant signed it on February 12, 1873. Its last form dropped the standard silver dollar, ended the two-cent piece, the three-cent silver piece and the half dime, and added a trade dollar.
The third was the China trade. American merchants in East Asia had to buy Mexican dollars, which merchants there preferred to the lighter American silver dollar. Knox and the Treasury agent Henry Linderman took up the idea of a heavier coin made for export. A House committee wrote a 420-grain "commercial dollar" into the bill in February 1872, and the Senate restored it as a trade dollar after the House had swapped it out for a standard dollar. The Mint made patterns at every stage. The commercial dollar first appeared in 1871 with Longacre's Indian Princess obverse, several more designs followed in 1872, and the name on the coin changed to TRADE DOLLAR before the act was signed. Linderman then had Barber's designs compared with drawings from the Philadelphia firm Bailey Banks & Biddle, and in June 1873 he chose a seated Liberty facing left, toward Asia. The first regular trade dollars were struck on July 11, 1873.
Many of these pieces were made for collectors as much as for the Mint's own use. USPatterns.com reports that the 1871 Longacre designs were sold in sets from the half dime to the dollar, that complete off-metal sets from the regular dies were struck each year for sale, and that the six 1873 trade dollar designs were sold in sets for $30. One 1871 dollar, the J-1132 muling with a No Motto reverse, is a fantasy. USPatterns.com notes that the Mint had claimed its old dies were destroyed, and that no one knows whether this piece was struck in 1871 or later.

















































